2121965056 has 40 divisors (see below), whose sum is σ = 4287515760. Its totient is φ = 1049038848.

The previous prime is 2121965039. The next prime is 2121965063. The reversal of 2121965056 is 6505691212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22285 + ... + 68851.

It is an arithmetic number, because the mean of its divisors is an integer number (107187894).

Almost surely, 2^2121965056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2121965056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2143757880).

2121965056 is an abundant number, since it is smaller than the sum of its proper divisors (2165550704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2121965056 is an frugal number, since it uses more digits than its factorization.

2121965056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46674 (or 46658 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 2121965056 is about 46064.7919348389. The cubic root of 2121965056 is about 1285.0284491574.

The spelling of 2121965056 in words is "two billion, one hundred twenty-one million, nine hundred sixty-five thousand, fifty-six".